(1) Where the Minister, having considered an application under section 21, is satisfied that the conditions specified in section 20(2) are met in relation to the giving of the authorisation which is the subject of the application, he or she shall, subject to this section, give an authorisation to the applicant.

(2)

(a) Subject to paragraph (b), an authorisation shall be given in writing and shall be signed by the Minister.

(b) Where the Minister considers that the case is one of exceptional urgency, he or she may give an authorisation orally provided that the authorisation shall be confirmed in writing as soon as practicable.

(c) An authorisation shall remain in force for a period not exceeding 24 hours.

(d) The maximum duration of a cessation period specified in an authorisation shall be a period not exceeding 6 hours.

(e) The Minister shall arrange for a record of any authorisation given under this section, including the reasons for giving such authorisation, to be kept.